By Piippo Sari   Huhta Ari-Pekka   Rautio Pasi   Tuomi Juha   in Canadian Journal of Botony

ISSN:1480-3305|83|4|405-412

NRC Research Press‎(2005)‎

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By Hellström Kalle   Rautio Pasi   Huhta Ari-Pekka   Tuomi Juha   in Flora

ISSN:0367-2530|199|3|247-255

Urban & Fischer‎(2004)‎

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